Very poor starting and running, injectors replaced, no improvement.
Poor and spongy brakes.
Noisy rear suspension.
Aircon (climate control) refused to work.
Alarm / immobiliser constantly faulty.
Random error reports on dashboard.
Info centre works only intermittently.
Seat fabric wearing very badly.
Loads of trim rattles.
Very disappointing, poorly built and inadequate dealer support.
Slow and tiresomely noisy at most speeds.
Awful fuel consumption, all of the compromises of diesel, but none of the claimed advantages.
Surprised by some of the comments here. I own a D5. The engine pulls pretty hard and I've owned a 170bhp Nissan 200SX, 155bhp Alfa 156, 138bhp Toyota MR2, 150bhp Nissan Almera GTI. All fairly swift cars. Perhaps yours was running off the boil, or you're other car is an Evo or something? The only car in the list above which pulls like my D5 was the turbo'd 200SX, and that had much more lag. The last couple of inches of pedal travel in the accelerator allows mine to be a bit of a hooligan's car, spinning fat front wheels in 2nd gear in the dry.
Also, noisy? On the motorway at 70-80 mph its very hushed in my opinion.